Interpretation of chromatogram

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1.
In my polychemistry laboratory , the task was to determine the Number Average Molecular Weight and the Weight Average Molecular weight of two samples , one a polystyrene sample prepared by radical polymerization , and the other a polystyrene-block-isoprene polymer prepared by anionic polymerization.Using Gel Permeation Chromatography . The GPC software generated an elugram and a weight distribution for each sample.

Homework Equations

PDI = Mw/Mn[/B]
This is the link to the plot https://docs.google.com/file/d/0Bw0SjzcEyj3GeTBIZ1NLanJuOWs/edit?pli=1 https://docs.google.com/file/d/0Bw0SjzcEyj3GeTBIZ1NLanJuOWs/edit?pli=1

The Attempt at a Solution

The plot for the first sample is easy to inteprete since it has a broad distribution .The plot for the second has another small peak to the right of the main peak , which I understand is the Copolymer .However I don't understand how that peak came about in relation to synthesis and Molecular Weight [/B]

 

[Greg Bernhardt]

Thanks for the post! Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?